EP1768429A1 - Système et méthode pour réduire la consommation d'énergie dans un appareil de communication radio - Google Patents

Système et méthode pour réduire la consommation d'énergie dans un appareil de communication radio Download PDF

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Publication number
EP1768429A1
EP1768429A1 EP05108825A EP05108825A EP1768429A1 EP 1768429 A1 EP1768429 A1 EP 1768429A1 EP 05108825 A EP05108825 A EP 05108825A EP 05108825 A EP05108825 A EP 05108825A EP 1768429 A1 EP1768429 A1 EP 1768429A1
Authority
EP
European Patent Office
Prior art keywords
controller
power level
wireless communication
power
communication device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05108825A
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German (de)
English (en)
Other versions
EP1768429B1 (fr
Inventor
David Yach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BlackBerry Ltd
Original Assignee
Research in Motion Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Research in Motion Ltd filed Critical Research in Motion Ltd
Priority to DE602005014483T priority Critical patent/DE602005014483D1/de
Priority to EP05108825A priority patent/EP1768429B1/fr
Priority to AT05108825T priority patent/ATE431689T1/de
Priority to CA2560552A priority patent/CA2560552C/fr
Publication of EP1768429A1 publication Critical patent/EP1768429A1/fr
Priority to HK07104034.3A priority patent/HK1096523A1/xx
Application granted granted Critical
Publication of EP1768429B1 publication Critical patent/EP1768429B1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the invention relates generally to the transmission of data to and from a wireless communication device and specifically for a system and method for reducing power consumed by the device while doing so.
  • GSM Global System for Mobile communication
  • TDMA time division multiple access
  • CDMA code division multiple access
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • GSM Global System for Mobile Communications
  • a power management controller for facilitating reduced power consumption when communicating between a wireless communication device and a wireless communication controller, the power management controller comprising: a power savings detector for detecting when power savings can be applied in accordance with whether or not data loss between the wireless communication controller and the wireless communication device can be tolerated; and a power level controller for selecting a reduced power level at which to transmit data.
  • a method for facilitating reduced power consumption when communicating between a wireless communication device and a wireless communication controller comprising the steps of detecting when power savings can be applied in accordance with whether or not lost data between the wireless communication controller and the wireless communication device can be tolerated; and selecting a reduced power level at which to transmit data.
  • a data storage device comprising instructions which, when executed on a computer, cause the computer to facilitate reduced power consumption when communicating between a wireless communication device and a wireless communication controller by implementing the steps of detecting when power savings can be applied in accordance with whether or not lost data between the wireless communication controller and the wireless communication device can be tolerated; and selecting a reduced power level at which to transmit data.
  • the GSM network 100 comprises a base station subsystem 102, a network subsystem 110 and a GPRS subsystem 120.
  • the base station subsystem 102 comprises at least one base transceiver station 104 and a base station controller 106.
  • the network subsystem comprises a mobile services switching centre 112, a visitor's location register 114 and a home location register 116.
  • the GPRS subsystem comprises a Serving GPRS Support Node (SGSN) 122, a Gateway GPRS Support Node (GGSN) 124 and a GPRS backbone network 126.
  • SGSN Serving GPRS Support Node
  • GGSN Gateway GPRS Support Node
  • GPRS backbone network 126 a GPRS backbone network 126.
  • the GPRS subsystem 120 is coupled with the network subsystem 110 via an interface network 130 using a set of digital-telephony protocols.
  • the interface network 130 uses the Signalling System 7 (SS7) protocols.
  • the GPRS subsystem 120 is further coupled to computing devices 140 via a communication network 132.
  • the communication network 132 may be a private network such as a corporate intranet or a public network such as the Internet, for example.
  • the network subsystem 110 is coupled with telephones 142 via a public switched telephone system (PSTN) 134.
  • PSTN public switched telephone system
  • Each of the GPRS subsystem 120 and the network subsystem 110 is connected to the base state subsystem 102 via a dedicated communication link.
  • the base station subsystem 102 is coupled to a plurality of different wireless devices (or simply devices) 144 via an over-the-air communication protocol such as Wireless Application Protocol (WAP).
  • WAP Wireless Application Protocol
  • the base station controller 106 provides the intelligence behind the base transmission stations 104. Typically, a base station controller 106 has tens or even hundreds of base transmission stations 104 under its control. The base station controller 106 handles allocation of radio channels, sets the power transmission requirements for the communication device, receives measurements from the communication device and controls handovers from base transmission station 104 to base transmission station 104 as the communication device moves there between.
  • power control from the base station controller 106 to the device 144 is designed to keep a continuous circuit-switched conversation going.
  • higher transmission power levels at the device 144 will result in fewer errors and/or dropped packets transmitted from the device 144 to the base station controller 106 than lower transmission power levels.
  • the base controller station 106 has to retransmit the data. Each retransmission is referred to as a retry.
  • the timing parameters do not allow for retries, so the base station controller 106 needs to get all or most of the data in one attempt. Accordingly, the transmission power level of the device 144 needs to be set sufficiently high. This requirement is one factor that enables a person to engage in a cellular conversation using the device 144 and experience minimal delays or dropped data.
  • retries are acceptable as long as they do not occur too frequently.
  • data communication such as electronic mail (email) exchange can often afford the delays caused by retries due to lost packets. This may be true for both a pull-based data environment, wherein the device 144 periodically polls for email messages, and a push-based data environment, wherein email messages are pushed to the device 144 without it having to make a request for information.
  • the base station controller 106 is responsible for indicating the power the device is to use for transmission. Accordingly, in the present embodiment, the base station controller 106 is provided with a power management controller (not shown).
  • the power management controller 200 includes a power saving determination unit 202, a power controller 204 and a power consumption monitor 206.
  • the power saving determination unit 202 determines whether or not the data exchange between the base station controller 106 and the device 144 can afford delays and the power level controller 204 determines the transmission power accordingly. The device 144 then uses the determined transmission power for communicating with the base station controller 106.
  • the power management controller 200 is implemented in software and executed by the base station controller 106.
  • the power management controller 200 determines whether or not the power required for the retries exceeds the power saved by using the lower transmission power and makes adjustments if necessary.
  • the power saving determination unit 202 determines whether or not an application operating on the device 144 and transmitting data requires minimal transmission interruptions or if it can accept delays for retries.
  • This step can be implemented a number of different ways.
  • the power management controller 200 includes a list of applications and associated flags signalling whether or not the application can accept delays.
  • the device 144 transmits data it initially indicates which application is in use.
  • the power saving determination unit 202 uses this application identifier to parse the list of applications and determine whether or not the application can accept delays due to retries.
  • the device 144 itself includes a list of applications and associated flags signalling whether or not the application can accept delays. When the device 144 transmits data, it initially indicates whether or not the application in use can accept delays.
  • the application 144 includes information regarding whether or not delays are acceptable. When the device 144 transmits data, it initially indicates whether or not the application in use can accept delays.
  • the power level controller 204 determines the device's transmission power level based upon whether the device can tolerate delays due to retries. If the device cannot tolerate the delays, the transmission power level is determined as is standard in the art and operation continues at step 306. At step 306, a standard transmission power level is communicated to the device 144 and the operation continues as is standard in the art.
  • the standard transmission power level is the transmission power level that would be determined in accordance with the transmission standard being used, which, in the present embodiment, is GPRS.
  • a reduced transmission power level is determined. It will be appreciated that different power reductions may be experimented with to determine an optimal reduced transmission power level. Further, it will be appreciated that not every base station controller 106 needs to have an equivalent power reduction.
  • step 308 the transmission power level is communicated to the device 144, which uses the reduced power transmission level to communicate with the base station controller 106.
  • the power consumption monitor 206 monitors the communication between the base station controller 106 and the device 144 for dropped packets and number of retries. Although the device 144 transmits at a lower power level, each retry consumes power. If too many retries are necessary, the power savings realized by the lower power transmission level may be negated or even reversed by transmitting the extra messages.
  • the power consumption monitor 206 calculates an estimated power savings. It is anticipated that in many cases, the number of retries will be sufficiently low such that an overall power saving will be realized and the operation stays at step 312 until the communication is complete.
  • step 306 the power level controller 204 transmits the standard transmission power level to the device 144.
  • the device 144 uses the standard transmission power level for the remainder of the communication.
  • the present embodiment may provide a power saving at the device 144.
  • the realized power saving can be exploited to provide longer battery life to the device 144 or facilitate a reduction of the battery size in order to allow for a smaller device form factor.
  • FIG. 400 a flow chart illustrating operation of an alternate embodiment of the invention is illustrated generally by numeral 400.
  • a reduced transmission power level and a standard transmission power level.
  • multiple power levels are available for further facilitating power savings.
  • step 402 the power saving determination unit 202 determines whether or not the application transmitting data requires minimal transmission interruptions or if it can accept delays for retries. Similar to the previous embodiment, this step can be implemented a number of different ways.
  • step 404 the power level controller 204 determines the device transmission power level. If the application cannot tolerate delays due to retries, the transmission power level is determined as is standard in the art and operation continues at step 406. At step 406, the standard transmission power level is communicated to the device 144 and the operation continues as is standard in the art.
  • step 404 if the device 144 can tolerate delays due to retries, a reduced, lowest transmission power is determined. Similar to the previous embodiment, it will be appreciated that different power reductions may be experimented with to determine an optimal lowest transmission power level.
  • step 408 the transmission power level is communicated to the device 144, which uses the transmission power level to communicate with the base station controller 106.
  • the power consumption monitor 204 monitors the communication between the base station controller 106 and the device 144 for dropped packets and number of retries. As previously described, although the device 144 transmits at a lower power level, each retry consumes power. If too many retries are necessary, the power savings realized by the lower power transmit level may be negated or even reversed by transmitting the extra messages.
  • the power consumption monitor 204 calculates an estimated power consumption. If the power consumption results in an overall power saving, the transmission power level is maintained until the transmission is complete.
  • step 414 the power level controller 204 increments the transmission power level to the next lowest transmission power level and transmits it to the device 144.
  • the device 144 uses this transmission power level for the communication and the operation returns to step 412. In this manner, the transmission power level can be incremented, if necessary, until the standard transmission power level is reached.
  • this embodiment may allow for greater power savings in certain circumstances such as, for example, where the lowest transmission power level is slightly below the transmission power level required to operate efficiently.
  • applications are assigned a Quality of Service (QoS).
  • QoS Quality of Service
  • the power transmission level of the device 144 for the application can then be determined in accordance with the application's QoS. For example, for an application with a high QoS, the device can be assigned the standard transmission power level. For an application with a low QoS, the device can be assigned the lowest or other reduced transmission power level.
  • the power management controller is implemented in software.
  • the power management controller may be implemented in hardware without affecting the scope of the invention.
  • the base station controller 106 assigns the transmission power level. It will be appreciated that this implementation is selected to easily integrate with the existing standard. However, the transmission power level may be determined at the device 144 instead of the base station controller 106.
  • the previous embodiments describe that if the reduced transmission power levels fail to provide a power savings, the standard transmission level is used for the remainder of the communication. However, it will be apparent that the reduced power level transmission may be retried upon a predetermined event such as an elapsed time or a change in base transmission station 104, for example, before the communication is complete.
  • the base station controller 106 in addition to determining whether or not the application can tolerate delays due to dropped packets, the base station controller 106 also examines its current network utilization and capacity. Therefore, for example, even though an application may be able to tolerate dropped packets, the reduced power transmission level may not be used if the system is running at, or near, capacity. The reason for this is the extra bandwidth that may be required by retries would put an unnecessary strain on the system.
  • the previous embodiments describe applications that can deal with some degree of packet loss by retries, which results in delays.
  • other applications are able to tolerate the packet loss by ignoring the data.
  • An example of such an application is a head to head action game between two mobile devices. In such an example, it will likely be possible to ignore a lost packet and update player information when a following packet arrives. It will be appreciated that it may not be necessary to monitor power savings for such applications, as retries are not required. Similarly, the network capacity would not need to be analyzed
  • the standard used for communication is GSM.
  • base station controller and other GSM-specific terms used herein are not intended to necessarily limit the invention to the GPS standard. Rather, the terms are intended to be understood in their generic sense.
  • the base station controller 106 can be generically represented as a wireless communication controller for controlling one or more cell sites' radio signals.
  • the dropped packets and number of retries may be monitored at the device 144.
  • the reduce transmission power level may also be used for base station transmission power.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transceivers (AREA)
  • Transmitters (AREA)
  • Circuits Of Receivers In General (AREA)
EP05108825A 2005-09-23 2005-09-23 Système et méthode pour réduire la consommation d'énergie dans un appareil de communication radio Active EP1768429B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE602005014483T DE602005014483D1 (de) 2005-09-23 2005-09-23 System und Verfahren zur Minderung vom Energieverbrauch eines drahtlosen Kommunikationsgeräts
EP05108825A EP1768429B1 (fr) 2005-09-23 2005-09-23 Système et méthode pour réduire la consommation d'énergie dans un appareil de communication radio
AT05108825T ATE431689T1 (de) 2005-09-23 2005-09-23 System und verfahren zur minderung vom energieverbrauch eines drahtlosen kommunikationsgeräts
CA2560552A CA2560552C (fr) 2005-09-23 2006-09-21 Systeme et methode pour reduire l'energie absorbee par un dispositif de communication sans fil
HK07104034.3A HK1096523A1 (en) 2005-09-23 2007-04-17 System and method for reducing power consumed by a wireless communication device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05108825A EP1768429B1 (fr) 2005-09-23 2005-09-23 Système et méthode pour réduire la consommation d'énergie dans un appareil de communication radio

Publications (2)

Publication Number Publication Date
EP1768429A1 true EP1768429A1 (fr) 2007-03-28
EP1768429B1 EP1768429B1 (fr) 2009-05-13

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EP05108825A Active EP1768429B1 (fr) 2005-09-23 2005-09-23 Système et méthode pour réduire la consommation d'énergie dans un appareil de communication radio

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Country Link
EP (1) EP1768429B1 (fr)
AT (1) ATE431689T1 (fr)
CA (1) CA2560552C (fr)
DE (1) DE602005014483D1 (fr)
HK (1) HK1096523A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0462952A1 (fr) * 1990-06-21 1991-12-27 Telefonaktiebolaget L M Ericsson Procédé de régulation de la puissance dans un système de communication numérique mobile
US5752197A (en) * 1993-09-03 1998-05-12 Nokia Telecommunications Oy Method for adjusting transmission power in a radio system, and an exchange
US6724719B1 (en) * 1999-02-19 2004-04-20 Nortel Networks Limited Determining transmit signal powers of channels in a CDMA communications system
US6868257B1 (en) * 1999-07-05 2005-03-15 Nokia Networks Oy Method for selection of coding method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0462952A1 (fr) * 1990-06-21 1991-12-27 Telefonaktiebolaget L M Ericsson Procédé de régulation de la puissance dans un système de communication numérique mobile
US5752197A (en) * 1993-09-03 1998-05-12 Nokia Telecommunications Oy Method for adjusting transmission power in a radio system, and an exchange
US6724719B1 (en) * 1999-02-19 2004-04-20 Nortel Networks Limited Determining transmit signal powers of channels in a CDMA communications system
US6868257B1 (en) * 1999-07-05 2005-03-15 Nokia Networks Oy Method for selection of coding method

Also Published As

Publication number Publication date
EP1768429B1 (fr) 2009-05-13
HK1096523A1 (en) 2007-06-01
CA2560552A1 (fr) 2007-03-23
CA2560552C (fr) 2011-04-12
ATE431689T1 (de) 2009-05-15
DE602005014483D1 (de) 2009-06-25

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